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Alongside HTML5 and CSS, JavaScript is one of the core languages
of the World Wide Web (WWW). It was developed by Brendan Tech Fact
Eich, a Netscape Communications Corporation programmer, in There are about 1.7 billion
1995. He takes only ten days to develop the language.
websites on the Internet
from which 95% websites
FEATURES OF JAVASCRIPT use JavaScript.
Some of the important features of JavaScript are as follows:
It is used in both client-side and server-side applications.
It is platform independent; hence, it runs on many operating systems.
It is used with HTML code and run on web browsers.
It is a case-sensitive and interpreted language.
It is used to validate user input for errors.
USING JAVASCRIPT
JavaScript cannot run on its own because it is a scripting language, and hence, needs to be embedded
within an HTML code.
In HTML5, we can use JavaScript in two ways: internally and externally.
Internal JavaScript
When JavaScript code is written within the HTML web page then it is called internal JavaScript. We
use the <SCRIPT> and </SCRIPT> tags to place the JavaScript codes either in the <HEAD> or <BODY>
tag of the HTML5 document. The syntax to add internal JavaScript is:
<HEAD>
<SCRIPT>
JavaScript code
.....
</SCRIPT>
<HEAD>
OR
<BODY>
<SCRIPT>
JavaScript code
.....
</SCRIPT>
</BODY>
Introduction to JavaScript 67

